iic_driver.rar_2410 driver_IIC_linux at24 e2pr_linux eeprom驱动_s3

//==================================================================== // File Name : 2410iic.c // Function : S3C2410 IIC-bus Master Tx/Rx mode Program // Date : July 16, 2004 // Version : 0.0 //==================================================================== #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <asm/irq.h> #include <linux/vmalloc.h> #include "khead.h" #define IICBUFSIZE 0x20 #define BIT_IIC (0x1<<27) #define rGPECON (*(volatile unsigned long *)r_GPECON) //Port E control #define rGPEUP (*(volatile unsigned long *)r_GPEUP) //Pull-up control E #define rIICCON (*(volatile unsigned char *)r_IICCON) //IIC control #define rIICSTAT (*(volatile unsigned char *)r_IICSTAT) //IIC status #define rIICADD (*(volatile unsigned char *)r_IICADD) //IIC address #define rIICDS (*(volatile unsigned char *)r_IICDS) //IIC data shift #define WRDATA (1) #define POLLACK (2) #define RDDATA (3) #define SETRDADDR (4) #define Uart_Printf PDEBUG #define U8 unsigned char #define U32 unsigned int static unsigned char _iicData[IICBUFSIZE]; static volatile int _iicDataCount; static volatile int _iicStatus; static volatile int _iicMode; static int _iicPt; extern void Test_Iic(void); extern void Init_Iic(void); extern void _Wr2410Iic_E2PROM(U32 slvAddr,U32 addr,U8 *buffer,U32 length); extern void _Wr2410Iic(U32 slvAddr,U32 addr,U8 wdata); extern void _Rd2410Iic_E2PROM(U32 slvAddr,U32 addr,U8 *buffer,U32 length); void Run_IicPoll(void); void IicPoll(void); int address_map(void); unsigned long r_GPECON,r_GPEUP; unsigned long r_IICCON,r_IICSTAT,r_IICADD,r_IICDS; //=================================================================== //*********************[ address_map ]********************************* int address_map(void) { r_GPECON =__ioremap(0x56000040,4,0); r_GPEUP =__ioremap(0x56000048,4,0); r_IICCON =__ioremap(0x54000000,4,0); r_IICSTAT =__ioremap(0x54000004,4,0); r_IICADD =__ioremap(0x54000008,4,0); r_IICDS =__ioremap(0x5400000c,4,0); return 0; } //*********************[ Delay ]********************************* void Delay(int times) { udelay(1000); } //**************[ _Wr2410Iic ]***************************************** void _Wr2410Iic_E2PROM(U32 slvAddr,U32 addr,U8 *buffer,U32 length) { //X1227 Page Write mode int i = 0; _iicMode = WRDATA; _iicPt = 0; _iicData[0] = addr/256; _iicData[1] = addr; for(i = 2; i<2+length; i++) { _iicData[i] = buffer[i-2]; } _iicDataCount = length+2; rIICDS = slvAddr&0xfe; //Master Tx mode, Start(Write), IIC-bus data output enable //Bus arbitration sucessful, Address as slave status flag Cleared, //Address zero status flag cleared, Last received bit is 0 rIICSTAT = 0xf0; //Clearing the pending bit isn't needed because the pending bit has been cleared. while(_iicDataCount!=-1) Run_IicPoll(); _iicMode = POLLACK; while(1) { rIICDS =slvAddr&0xfe; _iicStatus = 0x100; //To check if _iicStatus is changed rIICSTAT = 0xf0; //Master Tx, Start, Output Enable, Sucessful, Cleared, Cleared, 0 rIICCON = 0xaf; //Resumes IIC operation. while(_iicStatus==0x100) Run_IicPoll(); if(!(_iicStatus & 0x1)) PDEBUG("ACK is received\n"); break; //When ACK is received } rIICSTAT = 0xd0; //Master Tx condition, Stop(Write), Output Enable rIICCON = 0xaf; //Resumes IIC operation. Delay(1); //Wait until stop condtion is in effect. //Write is completed. } //**************[ _Wr2410_Iic ]***************************************** void _Wr2410Iic(U32 slvAddr,U32 addr,U8 wdata) { //X1227 byte write mode _iicMode = WRDATA; _iicPt = 0; _iicData[0] = addr/256; _iicData[1] = addr; _iicData[2] = wdata; _iicDataCount = 3; rIICDS = slvAddr&0xfe; //Master Tx mode, Start(Write), IIC-bus data output enable //Bus arbitration sucessful, Address as slave status flag Cleared, //Address zero status flag cleared, Last received bit is 0 rIICSTAT = 0xf0; //Clearing the pending bit isn't needed because the pending bit has been cleared. while(_iicDataCount!=-1) Run_IicPoll(); _iicMode = POLLACK; while(1) { rIICDS =slvAddr&0xfe; _iicStatus = 0x100; //To check if _iicStatus is changed rIICSTAT = 0xf0; //Master Tx, Start, Output Enable, Sucessful, Cleared, Cleared, 0 rIICCON = 0xaf; //Resumes IIC operation. while(_iicStatus==0x100) Run_IicPoll(); if(!(_iicStatus & 0x1)) PDEBUG("ACK is received\n"); break; //When ACK is received } rIICSTAT = 0xd0; //Master Tx condition, Stop(Write), Output Enable rIICCON = 0xaf; //Resumes IIC operation. Delay(1); //Wait until stop condtion is in effect. //Write is completed. } //************************[ _Rd2410Iic ]******************************** void _Rd2410Iic_E2PROM(U32 slvAddr,U32 addr,U8 *buffer,U32 length) { //X1227 Random read && Sequential read int i = 0; PDEBUG("read---->0\n"); _iicMode = SETRDADDR; _iicPt = 0; _iicData[0] = addr/256; _iicData[1] = addr; _iicDataCount = 2; rIICDS = slvAddr&0xfe; rIICSTAT = 0xf0; //MasTx,Start //Clearing the pending bit isn't needed because the pending bit has been cleared. while(_iicDataCount!=-1) Run_IicPoll(); _iicMode = RDDATA; _iicPt = 1; _iicDataCount = length; rIICDS = slvAddr|0x01; rIICSTAT = 0xb0; //Master Rx,Start rIICCON = 0xaf; //Resumes IIC operation. while(_iicDataCount!=-1) Run_IicPoll(); printk("In the Read Function\n"); for(i = 0; i<length;i++) { buffer[i] = _iicData[i+2]; // printk("The read num %d is %x\n",i,_iicData[i+2]); } } //**********************[ Run_IicPoll ]********************************* void Run_IicPoll(void) { if(rIICCON & 0x10) IicPoll(); } //**********************[IicPoll ]************************************** void IicPoll(void) { U32 iicSt,i; iicSt = rIICSTAT; if(iicSt & 0x8){ PDEBUG("bus arbitration is failed\n"); } //When bus arbitration is failed. if(iicSt & 0x4){ PDEBUG("matched\n"); } //When a slave address is matched with IICADD if(iicSt & 0x2){ PDEBUG("slave address 0000000b\n"); } //When a slave address is 0000000b if(iicSt & 0x1){ PDEBUG("Ack isn't received\n"); } //When ACK isn't received switch(_iicMode) { case POLLACK: PDEBUG("poll--ACK\n"); _iicStatus = iicSt; break; case RDDATA: PDEBUG("read--ACK\n"); if((_iicDataCount--)==0) { _iicData[_iicPt++] = rIICDS; rIICSTAT = 0x90; //Stop MasRx condition rIICCON = 0xaf; //Resumes IIC operation. Delay(1); //Wait until stop condtion is in effect. //Too long time... //The pending bit will not be set after issuing stop condition. break; }